PURPOSE: An apparatus of laterally transferring seeds for a transplanting machine is provided to maintain a seed placement table lateral conveying axis with a good lubrication condition over a long period of time by a simple structure. CONSTITUTION: An apparatus of laterally transferring seeds for a transplanting machine comprises a seed placement table lateral conveying axis (60) which is rotated by including a lateral transfer spiral groove (65) in a boundary surface; a carriage (61) which is engaged in the lateral transfer spiral groove while being inserted in the seed placement table lateral conveying axis and operates a seed placement table by being moved back and forth with the seed placement table lateral conveying axis and a pair of elastic cover cans (62) which are installed through a supporting part (64a) positioned in both end sides of the seed placement table lateral conveying axis and the carriage and cover the seed placement table lateral conveying axis. The apparatus arranges a contact evasion means performing the contact avoidance of the lateral transfer spiral groove and the elastic cover can by the deformation of the elastic cover can in the inner side of a pair of the elastic cans and includes a lubricating oil storage compartment (72) in the inner space.모종 재치대 횡이송 축을 양호한 윤활 상태로 장기에 걸쳐 간단한 구조로 유지할 수 있도록 한다.모종 재치대 횡이송 축(60)을 덮는 신축 커버 통(62)의 변형에 의한 신축 커버 통(62)과 횡이송 나선 홈(65)과의 접촉 회피를 도모하는 접촉 회피 수단(71)을 좌우 한 쌍의 신축 커버 통(62, 62)의 내측에 배치하고 있다. 좌우 한 쌍의 신축 커버 통(62, 62)를, 내부에 윤활유 저장실(72)을 형성하도록 구성되어 있다.